dict1 = {"name":"xiaoming","age":"28","sex":"nan"}
# print(dict1)
# dict1["地址"]="北京"
# print(dict1)
# dict1["地址"]="武汉"
# print(dict1)
# dict1.pop("地址")
# print(dict1)
# print(dict1["name"])
# print(dict1.get("age"))
for key in dict1.keys():
    print(key)
for value in dict1.values():
    print(value)
for k,v in dict1.items():
    print(k,v)